UNIO 5385 
This appeais to be a very solid species with rather sharply 
elevated beaks, the shell being higher in front than behind. 
It is strongly and irregularly concentrically sculptured, has 
heavy, split-up pseudocardinals, with a deep triangular pit be- 
hind those of the right valve. 1 am somewhat uncertain as to 
the generic position of this and the next species, never having 
seen the shells and knowing nothing of the anatomy, but from 
the description and figures I am inclined to think them most 
nearly related lo U. caffer. 
Unio HyGApPar us Bottger. 
Shell somewhat elongated, subrhomboid, subcompressed, 
solid, inequilateral; beaks high, rather sharp, indistinctly un- 
dulate ; anterior end rounded; base line nearly straight ; hinge 
line lightly curved, rounding into an oblique posterior sub- 
truncation; posterior ridge rounded, ending in a blunt point 
almost at the base of the shell; surface strongly concentrically 
sculptured; left valve with two pseudocardinals, the anterior 
elongated and curved, crenulate; muscle scars small, the an- 
terior ones double, deep. 
Length 54, height 26.5 mm. 
Kalahari Desert. 
Union (Hyridella) hygapanus Borrcrr, Ber. Senck. Ges., 1886, 
DB. 20; plas, figs: Sa,.50. 
Nodularia hygapanus Simpson, Syn., 1900, p. 827. 
Uno hygapanus CoNNouLy, Ann. $. A. Mus., XI, 1912, p. 274. 
Apparently nearly related to U. fissidens, but rather more 
elongated, less infiated and having pseudocardinals less split 
up. 
“Described from a single left valve; possibly only a less 
highly sculptured form of fissidens.” (Connolly. ) 
Group of Unio kunenensts. 
Shell elliptical, subinflated, solid, narrowly biangulate be- 
hind, the point of the shell being about midway up the height, 
the post-base inflated; beaks full, eroded in the specimen fig- 
ured, but no doubt zigzag sculptured; whole surface of the 
shell covered with wavy corrugations ; epidermis brownish ; one 
